<%= link_to_remote 'Reveal newest comments', {:update => "comments_list",
    :after => "insertWaitingImg('comments_list')",
    :url => {:controller => "comments", :action => "hide_comments" , :commentable_id => @commentable, :commentable_type => @commentable.class  },
    :complete => remote_function(:update => 'hide_reveal_comments',
    :after => "insertWaitingImg('hide_reveal_comments')", 
    :url => {:controller => 'comments', :action => 'reveal_comment_btn', :commentable_id => @commentable, :commentable_type => @commentable.class })
    } 
%> 